I have the moroso cold air induction and would recommend it. I tried the BBK kit (identical to the MAC) and it was a piece of crap and didnt fit very well. The top tube hit the strut tower brace for one.
I wouldnt count on much ET gains from this mod alone.
I use the crane FPR and it has been trouble free so far, and is inexpensive.
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1993 GT/AOD
'93 Mustang GT